How to make a model with a yes/no field, if yes that particular object (image) will be used as the background, and no other image will be selected.

I have come with this model:

    class BackgroundImage(models.Model):
        user = models.ForeignKey(user)
        caption = models.CharField(max_length=200)
        image = models.ImageField(upload_to=get_upload_file_name)
        using_image = models.BooleanField()

But with this I can select all of them, and not only one.

Lets take an example of profile picture. A user can have many images, but he can only select one as a profile picture. So, that if he selects one, the other will be un-select itself.
Hope everybody understood what I mean. Please ask me if didn't understood. Also please correct me if my model is not correct. Thank you!

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